Plow construction



May 19, 1942. H. E. ALTGELT PLOW CONSTRUCTION Filed Jan. 17, 1940 2 Sheets-Sheet l H. E. ALTGELT PLOW CONSTRUCTION Filed Jan. 17, 1940 2 SheetsSheet 2 INVENTOR.

ATTORNEY.

Patented May19, 1942 PLOW CONSTRUCTION Herman E. Altgelt, South Bend, Ind., assignor to -liver Farm Equipment. Company, a corporation of Delaware Application January 11.1940, Serial No. 314,212

Claims.

The present invention relates generally to plows, but more particularly to that type of plow generally known as a middlebreaker or lister.

In the manufacture of this type of plow it has been the well established practice to mould or form the right and left hand mouldboard section in one integral piece, or where the mouldboard sections are formed separately, separate dies are required to form right and left hand mould= boards. It has also been the practice heretofore to form the diverging shares and cooperating point as a single integral part and, when completely finished, secure the same to the lower adjacent edges of the diverging mouldboard sections to complete the middlebuster or lister. On account of the configuration and shape of this latter share, considerable expense has been involved not only in its production, but also in the cost of resharpening or replacement when it became necessary. Ewerience has also shown that the point of the share in this type of plow is the part subjected to the greatest wear and therefore in a short time the plow structure was rendered ineffieient by reason of the point be= coming worn. It is therefore one of the primary objects of the present invention not only to overcome the disadvantages hereinbefore pointed out, but also to provide separate share sections in combination with the removable point which permit the resharpening of the point or replacement thereof so as to maintain the eficiency of the plow structure at a minimum cost to the operator thereof.

A further object of the invention is to provide a novel and improved lister plow structure in which the share sections thereof are made in three separate parts namely, the point and two diverging share sections, so as to eliminate resharpening by the blacksmith or at least greatly simplifying this operation.

A still further object of the invention is to provide a novel and improved lister or middlebreaker plow structure in which the point thereof is made of a relatively small part and is detachably secured to the standard by a single bolt in such a manner that its opposite edges engage the forward inner edges of the adjacent share sections.

A further object of the invention is to provide a novel removable point construction in which the longitudinal opposite edges thereof occupy angular planes complementary to the planes of the contacting edges of the oppositely disposed adiacent share sections.

A still further object of the invention is to provide a novel and improved lister or middlebreaker type of plow construction in which the mouldboard sections thereof are made of separate members, namely right and left hand members, and from the same die having a cylindrical surface with the associated shares forming a continuation of said cylindrical surface.

A still further object of the invention is to provide a novel and improved construction of a lister or middlebreaker type plow in which a detachable point is secured between the inner edges of the diverging share sections; a portion of this point forward of the contiguous edges of the adjacent shares is wider than the contacting portions so as to protect the forward pointed edges of the shares and prevent grass and weeds from collecting between the point and the adjacent share sections.

These and other objects are accomplished by providing a construction and an arrangement of the various parts in the manner hereinafter described and particularly pointed out in the appended claims.

Referring to the drawings:

Fig. l is a top plan view of my improved plow construction of the middlebrealrer type;

Fig. 2 is a right hand side elevational view of the plow shown in Fig. 1;

Fig. 3 is a left hand side elevational view of the plow shown in Fig. 1;

Fig. d is a cross sectional view taken on the line M in Fig. 2;

Fig. 5 is a cross sectional view taken on the line t-s in Fig. i;

Fig. 6 is a fragmentary top plan view of my improved plow construction showing the manner in which the point contacts the adjacent parts; and

Fig. '7 is a fragmentary view with the plow slightly tilted from a top plan view showing the manner in which one of the edges of the point occupies a single plane with contacting edge of the adjacent share.

In illustrating one form of myimproved lister plow or middlebreaker, I have shown the same as comprising the usual standard or frog 40. Se-

cured to the opposite curved surfaces of the standard by means of bolts H are oppositely diverging right and left hand mouldboards l2 and i3 respectively. These mouldboards l2 and 43 are formed so that their scouring surfaces are in cylindrical form and are adapted to be made on the same die. The shape of the mouldboards are essentially identical except that one is a right hand while the other is a left hand mouldboard. By examining Fig. 1 of the drawings it will be seen that the left hand mouldboard l3 overlaps the forward longitudinal edge of the mouldboard I 2'as shown at I4. The lower edge of each of these mouldboards is beveled as shown at IS in Figs. 1, 2 and 5 of the drawings so as to permit the upper edge l6 of each of the right and left hand share sections l1 and I8 respectively to overlap.- These share sections or wings I1 and it have their scouring surfaces located in the same cylindrical surfaces with each of the complementary mouldboards I2 and I3 respectively. The-share sections l1 and I8 are secured to the standard III by means of bolts l9.

One of the essential features of the present invention consists in making the share sections and point of the lister plow in three separate parts so as to permit the resharpening or replacement of the points without the necessity of removing the share sections or wings. By so doing the manufacturer of the same is not only simplified, but the cost of replacement or resharpening is reduced to a minimum and the efficiency of the plow may be maintained at its maximum by reason of the fact that the point is maintained in a sharpened condition by either resharpening or replacement.

The point in this instance designated by the reference character has angularly disposed surfaces as shown at 2| and 22 whose curvature longitudinally occupies substantially the cylindrical surfaces of each of the complementary surfaces of the adjacent mouldboards and share sections. The opposite longitudinal contacting edges of the point 20 as shown at 23 and 24 are curved so that the intermediate portion as indicated at A is narrower than at the ends as indicated at B in Fig. 6. Each of these curved surfaces 23 and 24 of the point 20 occupy a single plane when contacting the complementary forward edge of the adjacent share I! and I8 respectively. (See edge 23 of the point 20 in Fig. 7 of the drawings.) The two planes passing through the surfaces of these two edges 23 and 24 form a dihedral angle at a point below the surface of the plow. The primary object in having each of these edges 23 and 24 in a single plane is that it facilitates thegrinding operation. The rearward end of the point 20 as shown at 25 contacts the lower forward edges as shown at 26 of each of the mouldboards l2 and I3. My improved detachable point 20 is secured to the lower end of the standard Ill by a single bolt 21. In order to protect the forward pointed portions l1 and I8 of each of the respective shares and to prevent grass and weeds from entering between these forward points, I have found it very desirable to widen or offset laterally the sides of the point as shown at 28. From this widened portion the opposite edges of the point 20 converge so as to form in effect a substan tially diamond shaped point indicated by the reference character 29.

Summarizing the advantages and functions of operation it will be readily seen that by forming the point and wings or shares of the lister plow in three separate parts instead of forming it integrally as heretofore, I have not only reduced the cost of manufacture and the cost of resharpening the same to a minimum, buthave also permitted the detachable point to be removed so that portion which is subjected to the greatest wear may be sharpened or replaced when required. In this connection it may be noted that the wings or share sections in this type of plow are not subjected to the amount of wear that the point is subjected to. There fore, the frequency of resharpening or replacing is not as important as the same is with respect to the point. Since the point is a relatively small part as compared with the three members when formed integrally as made heretofore, the cost of its replacement or resharpening therefore is reduced to a minimum.

It is obvious that by having the opposite edges of the point 20 in their respective single planes, these edges can easily be ground or finished to engage the abutting complementary edges of the adjacent shares. The enlarged or laterally projectlng portions 28 of the point 20 not only protects the sharp forward parts l1 and I8 of the shares l1 and I8, but also prevents grass and,

weeds from entering therebetween.

The advantages of having the mouldboards of the lister plow formed in two sections rather than made integrally or separately on different dies as heretofore, permits them to be made on the same identical die since they are formed on the same cylindrical surface, the only difference in structure being that one is a left hand mouldboard while the other is a right hand. This construction obviously reduces the cost of manufacture and replacement to a minimum.

While in the above specifications I have described one embodiment .of my invention, it will of course, be understood that the same is capable of modification and that modification may be made without departing from the spirit and scope of the invention as expressed in the following claims.

What I claim is my invention and desire to secure by Letters Patent:

1. A lister plow comprising a standard, sep arate diverging right and left hand mouldboards secured to said standard, right and left hand share sections adjacent said respective mouldboards, the forward edges of said shares being spaced apart and having their surfaces in two planes forming a dihedral angle, a point member having its opposite edges complementary to the dihedral surfaces of said shares, means for detachably securing said point to said standard,

'and' projecting outwardly with respect to the contiguous edges of said point and shares for deflecting material from entering between said point and said shares.

2. A lister plow comprising a standard, separate diverging right and left hand mouldboards secured to said standard, right and left hand share sections adjacent said respective mouldboards, the forward edges of said shares being spaced apart and having their surfaces in two planes forming a dihedral angle, a point member'having its opposite edges complementary to the dihedral surfaces of said shares, means for detachably securing said point to said standard, and means formed on the opposite sides of said point for preventing weeds and grass from entering between said point and the adjacent shares.

3. A lister plow comprising a standard, separate diverging right and left hand mouldboards secured to said standard, .right and left hand share sections adjacent said respective mouldboards, the forward edges of said shares being spaced apart and having their surfaces in two planes forming a dihedral angle, a point member having its opposite edges complementary to the dihedral surfaces of said shares, means for detachably securing said point to said standard,

and laterally projecting portions formed on said point for deflecting material away from the forward ends of said share sections.

4. A lister plow comprising a standard, separate diverging right and left hand mouldboards secured to said standard, the surfaces of said surfaces of said share sections, means for detachably securing said point to said standard between said share sections, and laterally projecting portions formed on the opposite sides of said point spaced forwardly of and projecting outwardly with respect to the contiguous edges of said point and shares for deflecting material from entering between said point and shares.

5. Alister plow comprising a standard, a right hand mouldboard, a left hand mouldboard, means for separately securing said mouldboards to said standard, a right hand share, a left hand share, means for securing said shares to said standard, a point mounted between said shares, means for securing said point to said standard, said mouldboards, shares and point being so positioned that the scouring surfaces thereof occupy two cylindrical surfaces whose axes in tersect at a point forward of said plow, and laterally projecting portions formed on the oppcsite sides of said point spaced forwardly of and projecting outwardly with respect to the contiguous edges of said point and shares for deflecting material from entering between said point and shares.

HERMAN E. ALTGELT. 

